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Author: WikiMatrix
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English[en]
In 11th-century Persia, Omar Khayyám compiled many tables and performed a reformation of the calendar that was more accurate than the Julian and came close to the Gregorian.
Swedish[sv]
I Persien sammanställde Omar Khayyám en rad tabeller och reformerade kalendern, vilket gjorde den mer exakt än den julianska kalendern och snarlik den gregorianska kalendern.